Seattle Seahawks

The Seahawks are the only NFL franchise based in the Pacific Northwest region of North America and thus attract support from a wide geographical area, including Oregon, Montana, Idaho, and Alaska, as well as Canadian fans in British Columbia and Alberta.

Seahawks fans have been referred to collectively as the "12th Man", "12th Fan", or "12s". The Seahawks' fans have twice set the Guinness World Record for the loudest crowd noise at a sporting event, first on September 15, 2013, registering 136.6 dB during a game against the San Francisco 49ers and again on December 2, 2013, during a Monday Night Football game against the New Orleans Saints, with a then record-setting 137.6 dB.